Stoker



" May 16, 1939. E. L. DE MOOY 2,15 3

. STOKER Original Filed Oct. 29, 1931 5 Sheets-$596 15 1 .4 TIDE/YE) May 16, [939.

E. L. DE MOOY STOKER 5 Sheets-Sheet '2 Original Filed Oct 29, 1931 Aw imme fUGf/VE A fii/vaox 64 W,

Arrae/vsy May 16; 1939.

E. L. DE MOOY STOKER I 5 Sheets-sheaf 3 Original Filed Oct. 29, 1951 //YVE/V7'02: [06am- L D's-"Moor I Arne/v5) May 16, 1939.

E. L. DE MOOY STOKER Original Filed Oct. 29, 1931 5 Sheets-Sheet 4 E. L. DE MOOY STOKER May 16, 1939.

Original Filed Oct. 29, 1931 5 Sheets-Sheet 5 Patented May 16, 1939 STOKER Eugene L. De Mooy, Cleveland, Ohio, assignor to Marcella M. De Mooy, Cleveland, Ohio Continuation of application Serial No. 571,757,.

October 29,. 1931.

This application January 4,

1937, Serial No. 119,051

6 Claims.

My invention pertains to a stoker and more particularly to a stoker adapted automatically to regulate the periodic supply of crushed coal to a domestic furnace.

1931; Serial No. 571,757.

One object of my invention has been to design a domestic stoker of compact and durable construction, reliable in operation and more economical in manufacture and such objects I have realized by successful operation of my model. Other objects have been to design a hopper agitator with a double movement, as arcuate wave like motion causing periodical heaving of the fuel to frustrate its tendency to pack and to clog the hopper outlet; to crush fuel particles of excessive size and thereafter to project the fuel released from the hopper aided by peculiarly directed air blasts and air inlets ahead of and behind the centrifugal propeller with reference to the direction of fuel delivery; to provide a double adjustment facility in association with a movable frame caster and in association with a shelf for supporting sources of power and to provide a traveling carriage together with means for retaining the carriage in its proper functioning position with reference to the furnace.

Adverting to the drawings:

Figure 1 isa side elevation of a stoker embodying my inventions, the same being shown in operative relationship to a standard form of do mestic furnace.

Figure 2 is a front elevation of my stoking apparatus.

Figure 3 is a section on line 3--3 of Figure 2 looking in the direction of the indicating arrows,

though on a somewhat enlarged scale.

Figure 4 is a section on line 44 of Figure-3. Figure 5 is an enlarged vertical longitudinal section, from front to rear, ofmy stoking apparatus.

Figure 6 is a section on line 6-6 of Figure 5. Figure 7 is a section on line 7-4 of Figures 5 and 10.

Figure 10 is a. section on line l0|0 5 looking downwardly.

Figure Figurell is a detailed sectional view on line ll|l of Figure 9.

Figure 12 is a side elevation of a mod portable type of my invention.

Figure 13 is a plan view on line l3-|3 of Figure 12.

A floor I supports any standard type of domestic furnace 2 which includes grate bars 3 supporting a fuel bed 4. At one side and near its bottom the ash pit is fashioned with an opening 5 the purpose of which will hereinafter appear, and the usual fire door 6 is hinged at I. For cooperation with my stoker the door 6 is supplied with an opening 8 which is clearly shown in Figure 5. i

A sturdy supporting frame includes a fuel delivery chute 9 the flanged mouth of which is bolted at 10 to the margin of the door opening andincidentally clamps a depending flange ll of a chute extension member l2 which projects into the fire box as clearly shown in Figure 5.

About on a level with the chute 9'is a peculiarly formed hollow structure l3 which has a horizontally projecting flange or web, bolted at l4 (Figures 1 and 5) to the top of a downwardly extending angle iron support I5, the lower end of which is fashionedas a socket I'B for the recep- =tion of a stud l1 adapted to be adjustably secured by means of set screws l8 and also adapted to carry a caster l9 which is movable along the floor I to provide an auxiliary support in cooperation with the door hinge 1 upon traveling an arcuate path as prescribed by the swing of the door 6.

A shelf 20 shown in Figures 1 to 4 is provided with a forked extension 2| having registering holes.22 for the reception of a dowel pin 23 which is' adapted simultaneously to pass through any one of a series of holes 24 which are provided along the lower portion of the support 15. By this means the shelf 20 may be held at any chosen elevation preparatory to tightening it by means of set screws 25. l

An electric motor 26 supported on one side of the shelf 20, has its shaft carrying a step pulley 21 and also therebeyond a blower 28 from which a flexible hose 29 leads to the opening 5. A smaller branch hose connection 30 (see. Figure 1) communicates through the bottom of' the upper end of the chute 9 as shownin Figures 1, 5 and 10.

A belt 3| connects the pulley 21 with another step pulley 32 which is fixed to one end (see Figure-6) of a shaft 33 which is mounted in bearings 34' located on opposite sides. of an impeller chamber 35, 'The chamber 35 is located in the lowerside of the fuel entry end of the chute 9 and the shaft=33 has keyed to it an impeller 36 provided with vanes 31, the orbital path of the extremities of which intersects the plane of the chute bottom as shown in Figure 5. The opposite end of the shaft 33 carries a worm 38 which meshes with a worm wheel 39 which is fixed to an oblique shaft 40 which is mounted in a bearing 4| and carries at its opposite projecting end a mitre gear 42 which meshes with a conjugate mitre gear 43 on the projecting end of a shaft 44 (Figure 6) which is mounted in bearings 45. The bearings 45 are parallel though elevated with reference to the bearings 34 and both are integral parts of the hollow structure l3. Between the bearings 45 the shaft 44 crosses a hopper-discharge passage which includes cylindrically surfaced side walls 46 as appears in Figure 5,

between which rotates a fuel crusher having a plurality of circumferentially projectingvanes 41; the forwardly presented sides of which, with reference to the indicated direction of rotation,

are fashioned with projecting lips 48 to simulate 20 a' hook-like formation intended to prolong the bite upon a piece of coal. Above the orbital path of the crusher the structure l3 assumes a bowl shape 49 which constitutes the supporting base of a hopper 50 riveted at the plurality of points 50a. That side of the interior of the bowl 49 which is approached by a vane 41 when it first commences to descend is fashioned with a projecting abutment 5| (Figure 5) the extremity of which has stepped formation 52 as clearly ap-\ pears in Figures 5 and 9. As exemplified, the parts 9, I 3, 49, 5| and 52 are of integral formation. I

The projecting left end (looking toward the furnace) of the shaft 44 has fixed to it a short crank pin 53 as appears to view' in Figures 1, 6 and 9. Articulating with the crank pin is one end of an upwardly bent rod 54 the opposite end of which articulates with one end of a rock lever 55 which ispivoted intermediately of its ends at 56 to a pedestal 51 on the top of chute 9. Near its two ends, the rock lever 55 isarticulated by means of a pair of rods 58 with diametrically opposite sides of an agitating device 59 having ,the shape of a ring and interiorly hung from the walls of the hopper 50 by a plurality of rods 68 pivotally connected at their ends. As exemplified by the drawings, four rods 66 are employed and their pivotal connections are effected (as best shown in Figure 11) by hooks 6! at their lower ends which engage quadrantly spaced holes in the ring 59 and at their upper ends with inversely bent hooks 62 which are passed through appropriately spaced holes in the hopper 59.

Inviting attention to Figures 5, 'l and 10, the branch air conduit 39 discharges into a distributing chamber 63 formed below the higher'end of the bottom of the chute 9 and communicating with two elongated passages 64 which extend along opposite sides respectively of the chute and communicate with the latter each through a plurality of obliquely directed apertures 65. Preferably, the apertures 65 are core or drill holes extending obliquely both toward the furnace opening 8 and towardthe bottom of the chute 9 shaft 44 rocks the lever 55 and accomplishes the peculiar agitating movement within the hopper which is one of the features of my invention. As the suspended ring 59 is alternately given partial turns in opposite directions it must rise obliquely as it is swung whereby it has imparted to it an arcuate wavelike or heaving motion which very successfully breaks down packed fuel not only at the bottom of the hopper, but along its sides. As the fuel with its various sized particles passes into the crusher it is carried around with it and positively conveyed past the projection 5| by the lips 48 on the vanes 41. Any lumps of coal which are of excessive size become crushed between the lips 48 and the stepped abutment 52, the formation of the latter facilitating the required crushing performance by accommodation to lumps of various sizes. After the crushed fuel drops below the crusher the upcoming vanes 31 will steadily project it upwardly into the upper part of chute 9 where the air blasts from the apertures 65 function to accomplish a spray and prolonged flotation of the fuel prior to discharge through the furnace opening 8. The draft opening 66 permits establishment of an air current as indicated by the arrows in Figure 5 and frustrates a clogging effect around the impeller 36. The result is the propulsion through the unrestricted opening 8 of a stream composed of thoroughly comingled fuel and air which unimpeded stream a swirling and an eddying whereby a uniform,

spread of fuel is accomplished, the fuel particles become welded to the fire bed and less fly ash is produced.

I claim:

1. In an over-feed stoker of the class described, the combination of a receiving chamber, means for admitting fuel to said chamber, a rotary impeller mounted therein and provided with projecting blades, a downwardly inclined chute provided with a discharge end and leading from one side of said chamber and adapted to convey crushed fuel propelled by said impeller, said chute being provided on opposite sides with apertures, those on one side converging with respect to those on the other side in the direction of propulsion of said fuel, the side of said chamber opposite to the one .from which said chute leads being provided with a draft opening in substantial alinement with the path of propulsion from said im peller, the direction of revolution of said blades being upward past said opening, means for forcing air through said apertures and driving means for said impeller.

2. In an over-feed stoker of the class described, the combination of a receiving chamber,-means for admitting fuel to said chamber, an impeller mounted therein, a downwardly inclined chute provided with a discharge end'and leading from one side of said chamber and adapted to convey crushed fuel propelled by said impeller, said chute being provided on each of its opposite sides with a series of apertures extending toward the disdirected'into the path of propulsion of the fuel, the side of said chamber opposite the one from which said chute leads being provided with a draft opening in substantial alinement with the path of propulsion from said impeller, means for forcing air through said apertures and driving means for said impeller.

3. In an over-feed stoker of the class described,

' charge end of the chute, the apertures beings the combination of a receiving chamber, means for admitting fuel to said chamber, an impeller mounted therein and provided with projecting blades, a downwardly inclined chute provided with a discharge end and'leading from one side of said chamber and adapted to convey crushed fuel propelled by said impeller, said chute being provided on each of its opposite sides with a series of apertures extending toward the discharge end of the chute, the apertures being directed into the path of propulsion of said fuel, the side of said chamber opposite the one from which said chute leads being provided with a draft opening in substantial alinement with the path of centrifugal propulsion from said impeller, the direction of movement of the blades of the impeller being upward past said opening, means for forcing air through said apertures and driving means for said impeller.

4. In apparatus of the class described, the combination of a fuel-receiving chamber having a draft hole in one of its sides, means for admitting crushed fuel through the upper side of said chamber, a centrifugal propulsion device mounted on a substantially horizontal axis near the bottom of said chamber and having vanes'adapted to intercept and to hurl fuel during their upward movement, an elongated chute provided with a.

sstream along said chute.

5. In a stokerfthe combination of a fuel-receiving chamber, means for admitting crushed fuel through the upper side of said chamber, a chute provided with a discharge end and extending laterally from said chamber and communieating with the upper portionof the latter, an air-distributing chamber at the point'of connection of saidfuel-receiving chamber and chute having air-passages communicating with the chute at its bottom and along its opposite sides, arotary impeller arranged to turn'on a substantially horizontal axis within a lower portion of said fuel-receiving chamber and adapted to have its upwardly moving side intercept admitted fuel and project it into the upper part of said chute, means for driving said impeller and means for forcing air through said air-distributing chamber and through the air-passages to prolong flotation of the fuel along said chute.

6. In a stoker, the combination of a chamber having an inlet and an outlet, means for supplying crushed fuel to said chamber, a fuel-intercepting and flipping device in said chamber and adapted to project intercepted fuel toward the outlet of said chamber, means for actuating said device, said chamber being additionally provided with a draft hole adjacent the orbital path described by an extremity of said device and fluidprojecting means cooperating with said draft hole for premixing air drawn through the latter with the projected fuel and for prolonging flotation of the flipped fuel during its violent projection through the outlet of said chamber.

. EUGENE L. DE MOOY. 

